US CO Bluetooth Headphones Have Fashion Style, different color can choose for match fashion clothing. headset appearance will not leave fingerprints. Bluetooth Version 4.0 , 24MBIT/S transmission rate, can transmit high bit rate music signals and establish connections quickly. High quality 40mm driver, multi-layer polymer crystals can demonstrate more substantial bass, brighter and wider treble effect, reducing the acoustic distortion and achieving high-fidelity sound effects greatly. Built-in high polymer battery, at the same time six-layer circuit board structure, eliminate the circuit mutual interference, accelerate charging, and reduce the battery power consumption effectively.